Is there any sanctioned mag lock i can use in order to not have to reg?

"Sanctioned" or approved by CA DOJ = no.

But, there are magazine locking devices that, when installed properly, meet the 2017 CA legal definition of a fixed magazine.
Which, can make the firearm no longer be considered an assault weapon.

Quote:

Originally Posted by Foebia

If i do have to register do i still need pics and all the residency stuff like the 80%?

Yes.

Quote:

Originally Posted by Foebia

I suppose i can remove the upper leave it in the safe until i move and still be legal?

If you disassemble the firearm into parts, then it will no longer meet the definition of an assault weapon and it does not neet to be registered as an assault weapon.
^It is prudent to store/transport those parts in seperate containers/locations.

The firearm can also be legally made into a featureless semi-auto centerfire rifle or a manually operated rifle or a rimfire rifle. All of which makes the firearm no longer meet the definition of an assault weapon and it does not neet to be registered as an assault weapon.

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"If someone has a gun and is trying to kill you, it would be reasonable to shoot back with your own gun.” - Dalai Lama (Seattle Times, 05-15-2001).